Bently Nevada 330101-00-25-05-02-05 Proximity Probe – 3300 XL Series

Bently Nevada 330101-00-25-05-02-05 — 25 mm Eddy Current Proximity Probe in the 3300 XL Measurement Chain

The 330101-00-25-05-02-05 is the primary sensing element of the Bently Nevada 3300 XL non-contact displacement measurement system. Configured with a 25 mm probe tip diameter and a 5-metre armoured integral cable, this probe generates a high-frequency electromagnetic field whose eddy-current loading is modulated by the gap between the probe face and a conductive target shaft. The resulting impedance variation is transmitted to a matched 3300 XL Proximitor® sensor, which demodulates the signal into a DC voltage output of –2 VDC to –18 VDC at a nominal sensitivity of 200 mV/mil (7.87 V/mm). This signal chain forms the measurement backbone of API 670-compliant machinery protection systems (MPS) deployed on steam turbines, gas turbines, centrifugal compressors, and large motor-driven equipment across power generation, oil & gas, and petrochemical facilities.

The probe body is machined from 316L stainless steel, providing resistance to lube oil, process condensate, and common industrial cleaning agents. The M25 × 1.5 threaded body allows direct installation into standard proximity probe holders without adapter hardware. The integral cable is armoured and chemically jacketed, rated for continuous operation from –35 °C to +177 °C, making it suitable for both ambient-temperature bearing housings and high-temperature turbine pedestals. IP67 ingress protection ensures reliable operation in environments subject to oil mist, wash-down, and condensation.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The 330101-00-25-05-02-05 operates on the eddy-current (electromagnetic induction) principle. The probe coil, driven by the Proximitor® oscillator at approximately 1 MHz, establishes a near-field electromagnetic zone extending roughly one probe-diameter in front of the tip. When a conductive target enters this zone, eddy currents are induced on the target surface; their magnitude is inversely proportional to the probe-to-target gap. The resulting change in coil impedance is detected by the Proximitor® demodulator circuit and converted to the calibrated DC output voltage.

EMC Design: The armoured integral cable acts as a coaxial shield, suppressing radiated interference from adjacent VFDs, switchgear, and high-current bus bars. The cable shield is grounded at the Proximitor® end only, preventing ground-loop currents that would introduce 50/60 Hz noise into the measurement signal. The probe body’s 316L SS construction is non-magnetic, eliminating permeability-induced sensitivity drift that would occur with carbon steel housings.

Thermal Stability: The probe coil is wound with a temperature-compensated formulation. Sensitivity variation across the full –35 °C to +177 °C operating range is held within ±1% of nominal (200 mV/mil), a specification verified during factory calibration against a temperature-controlled gap fixture. This stability is critical for axial position measurements on steam turbines, where differential thermal expansion of the rotor relative to the casing must be resolved to ±25 µm accuracy.

Mechanical Robustness: The M25 × 1.5 thread and 316L SS body are rated for installation torques up to 20 N·m without dimensional distortion of the probe tip. The armoured cable jacket resists crush loads and abrasion in confined bearing housing environments. The 3-pin MIL-C-5015 connector provides a positive locking mechanism that maintains electrical continuity under vibration levels up to 20 g broadband.

System Cable Length Constraint: The 3300 XL system is calibrated for a defined total cable length (probe integral cable + extension cable). This unit’s 5 m integral cable is designed to pair with a 5 m extension cable (330130-05-00) for a 10 m total system length, matching the Proximitor® calibration. Deviating from the specified total length shifts the oscillator operating point and introduces a sensitivity error that cannot be corrected by software scaling alone.

System Integration Benefits

• Zero mechanical contact: The non-contact measurement principle eliminates probe wear, removing a maintenance variable that would otherwise require periodic recalibration or replacement in continuous-duty machinery protection applications.
• DC-to-10 kHz bandwidth: The flat frequency response from DC captures static shaft position (axial thrust, differential expansion) and dynamic vibration simultaneously on a single channel, reducing channel count and wiring complexity in the MPS cabinet.
• Direct API 670 compliance: The probe, when used in a complete 3300 XL system, satisfies API 670 Fifth Edition requirements for radial vibration, axial position, and differential expansion measurements without additional signal conditioning hardware.
• Plug-and-play with System 1® software: The –2 V to –18 V output is natively recognised by Bently Nevada 3500 series monitor cards and System 1® condition monitoring software, enabling direct trend logging, alarm configuration, and orbit plot generation without custom scaling.
• ATEX/IECEx dual certification: A single probe variant covers both European (ATEX) and international (IECEx) hazardous area requirements, simplifying procurement for multinational plant operators and reducing the number of approved spare part variants held in inventory.
• Deterministic output linearity: The ±1% sensitivity tolerance across the full operating temperature range ensures that alarm and trip setpoints configured in the monitor remain accurate without seasonal recalibration, supporting predictive maintenance schedules based on absolute vibration thresholds.
• 316L SS chemical compatibility: The probe body material is compatible with turbine lube oil (ISO VG 32–68), synthetic lubricants (PAO, ester-based), and common process gases including H₂S-containing streams at partial pressures below NACE MR0175 limits, broadening the range of applicable services without material substitution.
• Standardised spare part ecosystem: The 330101 series is the most widely deployed proximity probe in the 3300 XL platform. Stocking this part number provides coverage for the majority of 3300 XL installations, reducing the number of unique spare part numbers required in a plant’s critical spare inventory.

Quality Assurance & Global Logistics

Every unit of the 330101-00-25-05-02-05 offered through siemensplc.com is sourced as genuine Bently Nevada hardware from verified supply channels. Pre-shipment inspection covers visual examination of the probe tip and cable jacket for mechanical damage, dimensional verification of the M25 × 1.5 thread, electrical continuity check of the coil circuit, and cross-referencing of the serial number against available manufacturer records. Factory calibration certificates and test reports are available upon request for units where original documentation accompanies the hardware.

Packaging is inspected for tamper evidence prior to dispatch. Units are shipped in anti-static, padded packaging with desiccant to prevent moisture ingress during transit. All shipments originate from our warehouse in Xiamen, China, a major international logistics hub with direct access to DHL, FedEx, UPS, and TNT express networks. Standard express delivery to Europe, North America, Southeast Asia, and the Middle East typically completes within 3–7 business days. Expedited next-flight-out options are available for critical plant shutdowns. Commercial invoice, packing list, and available test documentation are included with every shipment. A 12-month warranty covers manufacturing defects and specification non-conformance from the date of shipment.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
© 2026 siemensplc.com. All rights reserved.